
第28卷第5期 2014年10月
现代地质 GEOSCIENCE
Vol.28No.5
Oct.2014
塔里木盆地塔中一古城地区奥陶系碳酸盐岩
台地边缘相特征及演化王冠12,樊太亮1,2,刘海龙1,2(1.中国地质大学(北京)能源学院,北京100083;
2.中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室,北京100083)
摘要:塔里木盆地塔中一古城地区奥陶系碳酸盐岩台缘带的存在早已被证实,但由于地层深度大、钻井少、地震资料品质有限且经历多次构造运动,导致台缘带的空间展布、位置迁移等都尚无确凿定论。综合分析钻测井、地震剖面、岩心等资料,按时间顺序将研究区奥陶系台缘相带的发育分为3个阶段:下奥陶统蓬莱坝组有明显的镶边型台缘发育,近南北走向,整体呈“S"型展布;中下奥陶统鹰山组的台缘带与蓬莱坝组的展布范围大体相似,但在古隆1井处呈现反“S"型分布,镶边型和缓坡型都存在,相带变窄,略向台地内部收缩:上奥陶统恰尔巴克组一良里塔格组时期存在塔中南、北两个台缘相带,北坡台缘为缓坡型,南坡宽度略大且坡度变陡,为镶边型。奥陶纪台缘带的平面迁移整体呈现从南北向近“S"型逐渐变为开口向西的“V"型的特点;早中奥陶世台地边缘相带开始向盆地内部迁移,台地边缘一斜坡带也主要呈退积-加积式发育。奥陶纪晚期,海平面大幅下降,地层遭到严重剥蚀,残余的台缘带分布明显缩小。大
规模迅速海退之后,晚奥陶世的新一轮海进导致台地边缘相带向台地高部位逐步退缩。关键词:塔中-古城地区;奥陶系;碳酸盐岩台地边缘相;类型;展布;演化
中图分类号:TE121.3;P618.130.2
文献标志码:A
文章编号:10008527(2014)05099513
CharacteristicsandEvolutionofOrdovicianCarbonatePlatform
MarginalFaciesinTazhong-GuchengArea,TarimBasin
WANG Guan-2,FAN Tai-liang2,LIU Hai-long-2
(1. School of Energy Resources, China Unirersity of Geosciences, Beijing 100083, China ;
2. Key Laboratory of Marine Reseroir Erolution and Hydrocarbon Accumalation Mechanism, Ministry of Education
China Uninersity of Geosciences, Bejing100083, China)
Abstract : The existence of Ordovician carbonate platform margin has already been proved in Tazhong-Gucheng area, Tarim Basin. However, the distribution, thickness and migration of it are ambiguous because of the great depth of strata, less drilling and limited seismic data quality. Based on analysis of the residual strata, combined with drilling and well logging data, seismic profiles and core samples, the development of Ordovician carbonate platform margin in research area can be chronologically divided into three stages : (1) Lower Ordovician Penglai-ba Formation develops an obvious rimmed platform margin, nearly N-S trending, showing “s"-shape distribu-ee tion to Penglaiba Formation, but shows reverse “s"-shape around GL1 well; Rimmed and ramped types both exist, and slightly retract inward; (3) Upper Ordovician Qiaerbake Formation-Lianglitage Formation develops two separate platform marginal facies belts in the north and south of Tazhong uplift; the northern one is ramped type; the southemn one is rimmed type, with larger width and steeper slope. Generally, in Ordovician period,
收稿日期:2014-02-12;改回日期:2014-04-25;责任编辑:孙义梅。
基金项目:国家“973"项目中国早古生代海相碳酸盐岩层系大型油气田形成机理与分布规律下古生界碳酸盐岩优质储层形成与
分布预测”(2012CB214802)。
作者简介:王冠,女,硕士研究生,1990年出生,矿产普查与勘探专业,主要从事含油气盆地分析方面的工作。
Email:xihuanguanguan@gmail. com。